Calibration of Standard Hydrophones in the Frequency Range of 20 Hz to 200 kHz at 10 MPa Hydrostatic Pressure
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摘要: 介绍了在10 MPa静水压下校准20 Hz～200 kHz标准水听器的耦合腔互易法和自由场互易法，建立了最高静水压力为10 MPa、工作频率范围为20 Hz～3.15 kHz的耦合腔互易法校准装置和工作频率范围为3.15～200 kHz的自由场互易法校准装置。利用这些校准装置，分别对RHC14标准水听器和RHS30标准水听器进行校准，得到了它们在10 MPa静水压力下的灵敏度校准结果。不确定度分析表明，耦合腔互易法校准装置的扩展不确定度（k=2）为0.5 dB，自由场互易法校准装置的扩展不确定度（k=2）为0.7 dB（低于100 kHz频段）和0.9 dB（100～200 kHz频段）。这些校准装置和能力的建立，为深潜水声设备研制奠定了测试基础。Abstract: This paper describes the coupler reciprocity method and free-field reciprocity method used for standard hydrophones calibration in the frequency range of 20 Hz to 200 kHz at 10 MPa hydrostatic pressure, and the coupler reciprocity calibration facility working in the frequency from 20 Hz to 3.15 kHz and free-field reciprocity calibration facility working in the frequency from 3.15 kHz to 200 kHz was established on these methods. Standard hydrophones RHC14 and RHS30 were calibrated separately using these facilities, and their sensitivities at 10 MPa hydrostatic pressure was presented. Analyze of measurement uncertainties proved that the expand uncertainty (at k=2) of coupler reciprocity calibration facility was 0.5 dB, and free-field reciprocity calibration facility was 0.7 dB (below 100 kHz) or 0.9 dB (100 kHz to 200 kHz).The construction of these facilities and capabilities sets the test foundation for deep-diving underwater sound devices.
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Key words:
- calibration /
- standard hydrophone /
- high hydrostatic pressure /
- sensitivity
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